Patent GB-727584-A (GB)
Title: Improvements in or relating to the manufacture of shoes
IPC: A43D87/00
Filed: 1952-03-22
Abstract: 727,584. Cutting heel breast flaps. BRITISH UNITED SHOE MACHINERY CO., Ltd., PRATT, J. W., and HAZELTON, G. March 23, 1953 [March 22, 1952], No. 7442/52. Class 17(1). A machine for operating on a flap of a shoe sole on a shoe, which is later to lie against the breast face of a heel, comprises a pair of cutters arranged to act along opposite sides of the flap, means for bringing about relative movement between the cutters and the flap lengthwise of the flap to cut the sides of the flap, and means to cause the cutters to approach or recede from each other, while the relative movement is taking place, to shape the flap to the breast face. The extent of cutting is determined by measurement of the heel from front to rear, and the cutters are spaced at the base of the flap a distance corresponding to the width of the heel breast base. The machine has a.frame 2 on a column 4 with a head bracket 6 carrying a motor 8, countershaft bracket 12, equalizer bracket 14, and cutter arms 16, 18. A main slide 26 running from front to rear carries a cross slide 28, work support 30, clamp 32, and seat gauge.34. The slidable work support has an undersurface 40 against which the partially completed shoe is positioned while the flap rests on the top surface 36. The clamp 32 pivoted on a pivoted lever 46 and normally closed by means of spring 54, is released by means of a bell-crank 184, 186 normally held clear by a spring 190 but moved to swing lever 46 through cable 196 and treadle 198. Slide 26 is moved rearwardly by a cable 74 operated by a treadle 76, and returned by springs 80, motion to the rear being smoothed out by a dash pot and motion being limited by adjustable stops. Cutters 70, 72 on..opposite sides of the work support each comprise a multi-toothed disc cutter 116 for edge trimming and a multi-toothed skiving cutter 114 mounted on shafts 108, 110 from the arms 16, 18 pivoted to the head bracket 6. The cutters are adjusted vertically by slacking bolts 130 and adjusting screws 134 to slide brackets 118 vertically in arms 16, 18. The surface of the flap opposite that to be skived is engaged by work guides 136, adjustable vertically in brackets 140 by screws 154 and clamping bolts 150, the brackets being adjustable transversely. Rust extracting nozzles 156 are secured behind the cutters. Unison of the relative widthwise movement of the cutters is assured by equalizer links 160, 168, and equalizer lever 166 pivoted at 174 and transversely adjustable on bracket 14. Motor 8 through belt 214 drives a pulley 208 on shaft 202, and pulleys 204, 206 on the shaft through belts 210, 212 drive pulleys 122 on the cutter shafts 108, 110. A heel breast stop 222 and heel side stop 224 project from a table 220 on bracket 24 and a V-shaped heel gauge 226 engages the rear of a heel positioned against the stops, to measure the base of the heel. Gauge 226 is connected to a slide 228 which slides from front to rear, and a tongue 238 on the heel gauge slides in a transverse groove in slide 228 and prevents upward force on the gauge from straining the links joining the gauge to the slide. A pin 242 lies in a slot 244 in slide 228, projects through and below bracket 24, has flats engaging the sides of the slot and shoulders engaging the undersurface of slide 228, and is positioned along the slide by means of a screw 254 screwed therethrough, and secured by locknut 250. A pivoted bell-crank 262 has a forked arm 266 engaging pin 242, and an arm carrying a roll 270 and connected to a spring 272 which urges slide 228 towards stop 222. Roll 270 runs in a track 274 in a slide bar 276 slidable horizontally in a slide way 278 on slide 26 at right angles to track 274. Thus the length of the heel being gauged determines the position of slide 228, and of roll 270, and hence the lateral position of slide bar 276. A seat gauge slide 280 slidable from front to rear of slide 26 has an oblique slot 286 engaged by a pin 284 on bar 276, so that lateral movement of bar 276 moves slide 280 backward or forward relative to slide 26. A horizontal pin on slide 280 engages in slots in the seat gauge carrier 58 slidable in an inclined guideway 60 on bracket 38, so that movement of slide 280 causes forward and upward or backward and downward movement of the seat gauge 34 relative to support 30, thus movement of heel gauge 226 is transmitted to the seat gauge 34, determining the fore-and-aft position of the shoe relative to support 30, and varying the length of flap overlying the support. If necessary the seat gauge can be further adjusted by moving pin 242 relative to slide 228. A locking mechanism is provided for the seat gauge. A slidable side gauge 290, urged by spring 294, contacts the heel and measures its width from stop 224. A pin 296 in gauge 290 is forked at 298 to straddle a tongue 300 pivoted at 304 and lying in a recess 302, so that if torque is applied to pin 296 through lever 306 the fork 298 grips tongue 300 and locks the gauge. A lever 312 pivoted at 310 on the roll lever bracket 308 carries a roll 314 engaging a cam surface 338 on a cam plate 318 which is mounted on slide 28, controls the transverse movement of the cutter, and is replaceable to give a contour suited to the particular heel. When lever 312 is swung an adjustable stop screw 320 thereon engages either lever 306, to lock gauge 290, or abutment 295 on gauge 290 to move the gauge out of contact with the heel. A roll-lever operating lever is also fixed to pin 310. A bell-crank 326 pivoted at 324 has a forked arm 328 to engage pin 330 on lever 322, and an arm linked by rod 332 to a side gauge treadle 333. Thus depression of treadle 333 withdraws gauge 290, movement being limited by a stop screw 334 on lever 322. Slide 28 slides in and transversely of slide 26 and is urged leftwards by spring 348 to engage cam 338 and roll 314, and hold screw 320 against lever 306. The width of the heel determines the position of slide 28. The cutter arm roll 178 on arm 18 lies in a straight track 350 in a cam piece 352 on the cross slide. Thus plate 318, through slide 28, controls the transverse movement of the cutters. Flanged clamping pieces 356 overlie flanges 358 on the cam piece, permitting slight transverse movement of the ends of the cam track by means of bias pins 360 having eccentrics 362 engaged in holes in the cam piece 352. The pins are fixed to bias levers 364 having projecting handles and toothed ratchet pins 366 spring mounted in the levers engaging ratchet quadrants 368 concentric with the bias pins and bolted to the slide. Thus with levers 364 central in the quadrants track 350 lies accurately from front to rear, and movement of slide 26 causes cutters 70, 72 to follow the path prescribed by plate 318, but adjustment of levers 354 offsets track 350 to modify the path of the cutters. A stop screw 372 prevents the cutters from fouling the work when plate 318 is removed or the heel gauging position empty. Poweroperated means may be provided for traversing the main slide. In operation a heel is fitted in the gauges, whereby the seat gauge is adjusted, and roll 314 set to suit the width of the heel, and the selected plate 318 for controlling the cutters fitted. Guides 136 are adjusted or changed to give the desired edge thickness and angle of skive. The work is clamped with the rear of the shoe engaging the seat gauge, and the flap on the support. Treadle 76 is depressed to move slide 26, and as the work support moves back the flap margins pass beneath the guides and over and past the cutters. The shoe is supported by hand. When the slide reaches the rear stop the flap will have been carried past the cutters a distance, determined by the measurement of length of the heel seat, depending on the setting of the seat gauge.